How does rainwater harvesting work in the home & garden?

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Overflow

Excess water is drained into the sewage system or an infiltration system via the overflow siphon. Particles floating on the surface are also filtered out of the water in the event of overflows. The siphon ensures that no odours from the sewage system enter the tank.

Reversible flow filter

If using rainwater to flush your toilet and in your washing machine, we would recommend fitting a reversible flow filter. This filters out the finest of dirt particles and ensures superior water quality.

Washing laundry with rainwater

Rainwater contains no limescale-causing minerals and is therefore ideal for the washing machine. It makes laundry softer and easier to iron. If you wash your laundry with rainwater, you have no need for descaler or softener and will use up to 60 percent less detergent. Health experts confirm that washing laundry with rainwater is totally safe from a hygiene standpoint.

Steady inflow

Once it has passed through the filter, there are only very small particles of dirt left in the rainwater. Over time these sink to the bottom or float to the surface. The steady inflow prevents the sediment at the bottom of the tank from being stirred up.

Carat underground tank

An underground tank forms the very heart of the rainwater harvesting system. Depending on the desired size and installation situation, customers can choose between a traditional Carat underground tank or the Platin flat tank. Here the water is stored under optimum conditions.

Tank cover

The tank cover seals the rainwater harvesting system at the top edge of the ground. For optimum adjustment to local circumstances, its height can be continually adjusted and it can be tilted. It is sealed to the top edge of the ground. Depending on where it is installed, the cover may be suitable for pedestrian, vehicle or HGV loading.

System control

The system control of the rainwater harvesting system ensures constant water pressure in the supply network. It continuously controls the level of water in the tank and adds drinking water to the supply network if the tank level is too low.

Extraction

The rainwater reaches the individual consumption or extraction points via the supply network. 50 % of drinking water can therefore be replaced with rainwater at no inconvenience to yourself.

Filter

Before the rainwater enters the tank, it must be cleaned by a filter. This is essential for the quality of the harvested rainwater. GRAF provides numerous filter systems for very different requirements.

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